Device for resurfacing grinding wheels



Oct 12, 1948. NAGY ET AL 2,451,235

DEVICE FOR RESURFACING GRINDING WHEELS Original Filed Jan. 5, 1946 2 Sheets-Sheet 1 m :04 4 1 ll EL 4 a2,

INVENTORS MILO J'- NHGY BY LQU\S BE-LZ.

l 2- r ATTORNEY Oct 12, 1948. J, NAGY AL 2,451,235

DEVICE FOR RESURFACING GRINDING WHEELS Original Filed Jan. 5, 1946 2 Sheets-Sheet 2 INVENTORS M o J'- NAaY Louis BELIL ATTORNEY Patented Oct. 12, 1948 DEVICE FOR RESURFACING GRINDING WHEELS 'lviilo J. Nagy, Richmond Hill, and Louis Belz, Brooklyn, N. Y.

Substituted for appiicaiion Serial No. 639,202,

January 5, 1946.

This application December 10, 1947, Serial No. 790,780

4 Claims.

This invention relates to new and useful improvements in a device for re-surfacing grinding wheels.

This is a substitute for our former application filed on January 5, 1946, Serial No. 639,202, now abandoned.

More specifically, the present invention proposes the construction of a device for re-suriacing grinding wheels such as emery or carborundum wheels, characterized by having a support which can be clamped onto the casing of the grinding wheel and having a diamond holder which can be moved in a direction parallel to the axis of the grinding wheel and perpendicular thereto.

Another object is to provide a device as aforesaid in which the diamond holder is manually movable in a direction parallel to the axis of the grinding wheel and mechanically movable perpendicular thereto.

A further object is to provide a device as aforesaid in which the diamond holder is mechanically movable in both of its directions.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a perspective view of a device constructed in accordance with this invention.

Fig. 2 is a plan of Fig. 1.

Fig. 3 is a rear view of Fig. 1.

Fig. 4 is a section on the line 44 of Fig. 3.

Fig. 5 is a view similar to Fig. l of a device constructed in accordance with a modification of this invention.

Fig. 6 is a rear view of Fig. 5.

Fig. '7 is an enlarged detail of a part of the device of Fig. 5.

Fig. 8'is a section on the line 8--8 of Fig. 6,

Fig. 9 is a plan of the device of Fig. 5.

The grinding wheel re-surfacing device of Figs. 14, according to this invention, comprises a clamp it for securing the device to the casing enclosing a grinding wheel, the clamp being secured in the window in front of the grinding wheel where ordinarily the tool to be ground is inserted. The grinding wheel mechanism forms no part of the present invention and is thus not shown.

Clamp .10 includes a vertical rear wall H, a

top horizontal wall l2 and a bottom horizontal wall I3. The bottom wall i3 has a circular portion provided with a threaded orifice I l in which is screwed a clamping screw l5 having a head 26 below the wall [3. A bar H is slidably disposed in an horizontal orifice in the head it and is used for turning the screw !5. The bar has bulbs 58 at its ends preventing it from being with drawn from the head It. Screw i5 is adapted to be tightened against an appropriate part of the grinding wheel casing to secure the device in the window in front of the grinding wheel so that it can be employed to re-surface the grinding wheel as will presently appear.

The top wall 12 has downwardly converging sides 59 providing on the top wall, a dove-tail tongue. This tongue has a central bore 25 extending forwardly and rearwardly. The bore is interrupted in its middle by a chamber 2 i.

The device further includes a guide '22. The guide has an upwardly opening channel 23 having a bottom wall 24 and side walls 25. Plates 25 are secured to the bottom of the bottom wall 2:; by screws 2?, one at each side thereof, the plates being spaced and having downwardly con-- verging inclined inner edges 28 forming a dovetail groove for the tongue E2. The tongue i2 is slidably disposed in the dove-tail groove.

A screw 29 is disposed in bore 2ii. The screw has. a shoulder 33 bearing against the rear face of the wall I! and has two locked nuts 35 at its other end forming a shoulder bearing against the front edge of the tongue Q2. The bore 28 is smooth, but disposed in the chamber M, which is elongated, in a threaded boss 32 secured to the wall 24 of the channel 23. Screw 29 terminates in a knurled head 33 having a pin 3 3 extending transversely therethrough. 'By rotating the pin 34 and thus the screw 25, the guide 22 is moved back and forthalong the tongue l2. Thus the guide can be moved toward and away from the grinding wheel by the screw 29. The bottom wall 24 has a curved groove 35 for permitting the nuts 31 to move along this bottom wall.

Two parallel bars 36 and 3? are secured in the side walls 25 of the channel. Bar 36 is at the front and is higher than bar 3?. A block-38 is slidably mounted on these two bars with its bottom 39 having a clearance between it and the top face of the wall- 24. Block 38 is provided with a bore M extending forwardly and rearwardly and being inclined downwardly in a forward direction. A tool 4! is slidably disposed in this bore '49 and is adapted to'be secured therein at any desired position by a set screw 42. This tool includes a point for re-surfacing the grinding wheel and may be made of suitable hard steel or may have a diamond 43 inbedded. This diamond 43 is set at an angle suitable for dressing the wheel, no adjustment of the machine being necessary. The block is adapted to be manually moved along the bars 36 and 3'5.

The operation ofthe device is as follows:

The device is clamped, as aforedescribed, so that the diamond will be at the center of the surface to be refaced when the block is at the center of the guide. The screw 29 is then rotated to bring the diamond into contact with the grinding wheel face. The grinding wheel is then rotated and the block moved manually back and. forth. As the grinding wheel is worn away by the diamond, the diamond is moved forward by means of the screw 29.

A device constructed in accordance with a modification of the invention is shown in Figs. 5-9. It distinguishes from the device of Fig.1 in that instead of the bar 37, a bar 3? is employed which has extensions 4 i outwardly of each side wall This bar has threads between the side walls 25 and the block 38 has a threaded orifice 6 for the threads 55. Each end of the bar 3? has a recess 4? and a crank is adapted to be secured on either end of the bar 3? and secured thereon by a set screw 48 tightened against the adjacent recess 47. Collars 49 on the bar 31' adjacent the outer faces of the side walls 25' prevent axial movement of the bar 37, each of these collars being secured on the bar 31' by a set screw 55. In this form of the invention,

the bottom 39' frictionally engages the top face of the wall 24.

The operation of the device of Figs. 5-9 is similar to that of the device of Figs. 1-4 except that the block is moved along the bars by means of the crank 58. Thus the block is mechanically moved by the crank :38 and the guide is mechanically moved by the screw 29 whereas in the device of Figs. 1-4 the block is manually moved.

Other parts of the device of Figs, 5-9 correa vice itself.

While we have illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new and desire to secure by United States Letters Patent is:

1. A device for re-surfacing the grinding faces of grinding wheels comprising a clamp for mounting said device in position for said re-surfacing, said clamp having a vertical rear wall, a bottom wall having a threaded bore, a screw in said bore, and a top wallhaving downwardly converging side edges, a central smooth bore and a chamber in- V terrupting said smooth bore at its middle, a guide slidably mounted on said top wall and hav ing inclined edges corresponding to and engaging 4 said top wall converging edges, upstanding side walls, two parallel bars mounted in said side walls, and a block movably mounted on said parallel bars, a boss secured to said guide and disposed in said chamber, said boss having a threaded bore, a screw in said top wall bore threaded through said boss threaded bore and having shoulders abutting the front and rear edges of said top wall whereby rotation of said last mentioned screw will move said guide along said top wall, said block having a forwardly and downwardly inclined bore, a tool in said block bore and means for adjustably securing said tool in said block bore, said tool being movable in' two directions by movement of said guide along said top wall and movement of said block along said bars.

2. A device for re-surfacing the grinding faces of grinding wheels comprising a clamp for mounting said device in position for said re-surfacing, said clamp having a vertical rear wall, a bottom wall having a threaded bore, a screw in said bore, and a top wall having downwardly converging side edges, a central smooth bore and a chamber interrupting said smooth bore at its middle, a guide slidably mounted on said top wall and having inclined edges corresponding to and engaging said top wall converging edges, upstanding side walls, two parallel bars mounted in said side walls, and a block movably mounted on said parallel bars, a boss secured to said guide and disposed in said chamber, said boss having a threaded bore, a screw in said top wall bore threaded through said boss threaded bore and having shoulders abutting the front and rear edges of said top wall whereby rotation of said last mentioned screw will move said guide along said top wall, said block having a forwardly and downwardly inclined bore, a tool in said block bore and means for adjustably securing said tool in said block bore, said tool being movable in two directions by movement of said guide along said top wall and movement of said block along said bars, both of said bars being smooth and said block being manually movable thereon.

3. A device for re-surfacing the grinding faces of grinding wheels comprising a clamp for mounting said device in position for said l e-surfacing, said clamp having a vertical rear wall, a bottom wall having a'threaded bore, a screw in said bore, and a top wall having downwardly converging side edges, a central smooth bore and a chamber interrupting said smooth bore at its middle, a guide slidably mounted on said top wall and having inclined edges corresponding to and engaging said top wall converging edges, upstanding side walls, two parallel bars mounted in said side walls, and a block movably mounted on said parallel bars, a boss secured to said guide and disposed in said chamber, said boss having a threaded bore, a screw in said top wall bore threaded through said boss threaded bore and having shoulders '7 abutting the front and rear edges of said top wall 1 whereby rotation of said last mentioned screw will move said guide alongsaid top wall, said block having a forwardly and downwardly inclined bore, a tool insaid block bore and means for adjustably securings'aid tool in said block bore, saidtool being movable in two directions by movement of said guide along said top wall and movement of said block along said bars, one of said bars being 7 I threaded and having'threaded engagement with said block, and a crank for. rotating said threaded of grinding wheels comprising a clamp for mounting said device in position for said re-surfacing, said clamp having a vertical rear wall, a bottom wall having a threaded bore, a screw in said bore, and a top wall having downwardly converging side edges, a central smooth bore and a chamber interrupting said smooth bore at its middle, a guide slidably mounted on said top wall and having inclined edges corresponding to and engaging said top wall converging edges, upstanding side walls, two parallel bars mounted in said side walls, and a block movably mounted on said parallel bars, a boss secured to said guide and disposed in said chamber, said boss having a threaded bore, a screw in said top Wall bore threaded through said boss threaded bore and having shoulders abutting the front and rear edges of said top wall whereby rotation of said last mentioned screw will move said guide along said top wall, said block having a forwardly and downwardly inclined bore, a tool REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 456,954 Housel Aug. 4, 1891 1,214,098 Wagner Jan. 30, 1917 1,596,701 Williams Aug. 17, 1926 1,867,939 Davenport July 19, 1932 2,401,594 Wallace June l, 1948 

